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git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant@1 8a3a26a2-13c4-0310-b231-cf6edde360e5
2006-02-10 22:01:20 +00:00
commit 12b372f89c
1589 changed files with 431686 additions and 0 deletions
--- a/libs/modulesystem/singletonmodule.h
+++ b/libs/modulesystem/singletonmodule.h
@@ -0,0 +1,150 @@
+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_MODULESYSTEM_SINGLETONMODULE_H)
+#define INCLUDED_MODULESYSTEM_SINGLETONMODULE_H
+
+#include "modulesystem.h"
+#include <cstddef>
+#include "debugging/debugging.h"
+#include "modulesystem/moduleregistry.h"
+#include "generic/reference.h"
+
+template<typename API, typename Dependencies>
+class DefaultAPIConstructor
+{
+public:
+  const char* getName()
+  {
+    return typename API::Name();
+  }
+
+  API* constructAPI(Dependencies& dependencies)
+  {
+    return new API;
+  }
+  void destroyAPI(API* api)
+  {
+    delete api;
+  }
+};
+
+template<typename API, typename Dependencies>
+class DependenciesAPIConstructor
+{
+public:
+  const char* getName()
+  {
+    return typename API::Name();
+  }
+
+  API* constructAPI(Dependencies& dependencies)
+  {
+    return new API(dependencies);
+  }
+  void destroyAPI(API* api)
+  {
+    delete api;
+  }
+};
+
+class NullDependencies
+{
+};
+
+
+template<typename API, typename Dependencies = NullDependencies, typename APIConstructor = DefaultAPIConstructor<API, Dependencies> >
+class SingletonModule : public APIConstructor, public Module, public ModuleRegisterable
+{
+  Dependencies* m_dependencies;
+  API* m_api;
+  std::size_t m_refcount;
+  bool m_dependencyCheck;
+  bool m_cycleCheck;
+public:
+  typedef typename API::Type Type;
+
+  SingletonModule()
+    : m_dependencies(0), m_api(0), m_refcount(0), m_dependencyCheck(false), m_cycleCheck(false)
+  {
+  }
+  explicit SingletonModule(const APIConstructor& constructor)
+    : APIConstructor(constructor), m_dependencies(0), m_api(0), m_refcount(0), m_dependencyCheck(false), m_cycleCheck(false)
+  {
+  }
+  ~SingletonModule()
+  {
+    ASSERT_MESSAGE(m_refcount == 0, "module still referenced at shutdown");
+  }
+
+  void selfRegister()
+  {
+    globalModuleServer().registerModule(typename Type::Name(), typename Type::Version(), APIConstructor::getName(), *this);
+  }
+  
+  Dependencies& getDependencies()
+  {
+    return *m_dependencies;
+  }
+  void* getTable()
+  {
+    if(m_api != 0)
+    {
+      return m_api->getTable();
+    }
+    return 0;
+  }
+  void capture()
+  {
+    if(++m_refcount == 1)
+    {
+      globalOutputStream() << "Module Initialising: '" << typename Type::Name() << "' '" << APIConstructor::getName() << "'\n";
+      m_dependencies = new Dependencies();
+      m_dependencyCheck = !globalModuleServer().getError();
+      if(m_dependencyCheck)
+      {
+        m_api = APIConstructor::constructAPI(*m_dependencies);
+        globalOutputStream() << "Module Ready: '" << typename Type::Name() << "' '" << APIConstructor::getName() << "'\n";
+      }
+      else
+      {
+        globalOutputStream() << "Module Dependencies Failed: '" << typename Type::Name() << "' '" << APIConstructor::getName() << "'\n";
+      }
+      m_cycleCheck = true;
+    }
+
+    ASSERT_MESSAGE(m_cycleCheck, "cyclic dependency detected");
+  }
+  void release()
+  {
+    if(--m_refcount == 0)
+    {
+      if(m_dependencyCheck)
+      {
+        APIConstructor::destroyAPI(m_api);
+      }
+      delete m_dependencies;
+    }
+  }
+};
+
+
+#endif